4.8 hyperthreading changes
Aristedes Maniatis
ari at ish.com.au
Fri Mar 28 18:05:49 PST 2003
From the 4.8 changes page I found this:
> FreeBSD now has rudimentary support for HyperThreading (HTT). SMP
> kernels with the HTT kernel option will detect and start up the
> logical processors on HTT-capable machines. The logical processors
> will be treated like additional physical processors for the purposes
> of process scheduling.
On the 4.7 deployment systems I am running I have dual Xeon CPUs with
hyperthreading. They appear as 4 CPUs in 'top'. That would seems to
indicate to me that FreeBSD is scheduling them as four separate
processors, however the note from:
http://www.freebsd.org/relnotes/4-STABLE/relnotes/i386/x19.html#KERNEL
makes it seem like this is a new 4.8 feature. Should I be concerned
about upgrading when 4.8 is released in order to obtain the benefits of
better use of these CPUs?
Ari Maniatis
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